Air quality monitor



FIG. 1 is a perspective view of an air quality monitor showing the new design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines represent the portions of the design that form no part of the claim. 

CLAIM The ornamental design for an air quality monitor, as shown and described. 